SKELETAL SYSTEM
How many bones does an adult human usually have?
206 bones
Which muscle helps you smile?
Facial Muscles (risorius)
What is the main function of the heart?
To pump blood through the pulmonary and systemic circulations.
Which organ do humans use to breathe?
The lungs
Where does food enter the digestive system?
The mouth
Which PART OF THE BONE produces red blood cells, white blood cells, and platelets?
Red bone marrow
Which muscle type is found in the walls of the stomach?
Smooth Muscle
Which blood cells help fight infections?
White blood cells.
Which tube carries air from the throat toward the lungs?
The trachea.
Which organ moves food from the mouth to the stomach?
The esophagus.
What connects one bone to another bone?
A ligament
What happens to a muscle when it contracts?
It produces force and usually becomes shorter.
Which blood cells carry most of the oxygen?
Red blood cells.
Which gas do body cells use to release energy from food?
Oxygen
What is the main job of digestive enzymes?
To break food into smaller molecules.
What vitamin helps the body absorb calcium?
Vitamin D
What molecule gives muscles energy?
ATP
A person has a cut and starts bleeding. What helps stop the bleeding?
The platelets
A person coughs when food enters the airway. Why is coughing useful?
It helps remove material from the airway.
A person has trouble swallowing. Which tube carries food to the stomach?
The esophagus
A person cannot bend their knee because the joint is damaged. What type of joint is the knee?
A hinge joint.
A person can move their arm but cannot feel it. Which system carries touch signals to the brain?
The nervous system
A patient has very few red blood cells. Why might the patient feel tired?
The body receives less oxygen.
A person stops breathing. Why can the brain be damaged?
Brain cells need oxygen to survive.
A person eats food but cannot absorb enough nutrients. Can they become weak even if they eat every day?
Yes. The body needs to absorb nutrients from food.